Accession Number : ADA247593

Title :   Mg-Si-Al Oxynitride Glasses.

Descriptive Note : Final rept.,

Corporate Author : ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s) : Messier, Donald R. ; Gleisner, Robert P.

Report Date : FEB 1992

Pagination or Media Count : 16

Abstract : The glass-forming region at 1650 deg C was investigated for Mg-Si-Al-O-N compositions containing up to 20 equivalent % N (16 atomic %), and glass batches of up to 30 g were prepared and characterized. Glasses containing up to 8 atomic % N were grey colored, but transparent, while crystal-free glasses with higher N contents were unattainable. Little, if any, N loss occurred during melting; glass density, microhardness, and elastic modulus all increased with N content. The origins and consequences of the metallic precipitates that cause the grey color are discussed in the context of the literature on glasses prepared under reducing conditions. Oxynitride glasses, Mechanical properties, Glasses, Metallic precipitates, Physical properties, Thermal decomposition.

Descriptors :   *GLASS, *MECHANICAL PROPERTIES, *OXYNITRIDES, *PHYSICAL PROPERTIES, *MAGNESIUM, *SILICON, *ALUMINUM, COLORS, CRYSTALS, DENSITY, MELTING, MICROHARDNESS, PRECIPITATES, REGIONS.

Subject Categories : Ceramics, Refractories and Glass
      Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE